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arm raspi2/raspi3 emulation has no USB support
Using Qemu 2.12.0 on ArchLinux.
Trying to emulate arm device with `qemu-system-arm` and attach usb device for unput using
` -usb -device usb-host,bus=001,vendorid=0x1d6b,productid=0x0002 `
# lsusb returns
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 014: ID 13d3:3487 IMC Networks
Bus 001 Device 004: ID 0457:11af Silicon Integrated Systems Corp.
Bus 001 Device 003: ID 0bda:57e6 Realtek Semiconductor Corp.
Bus 001 Device 002: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
# qemu returns
qemu-system-arm: -device usb-host,bus=001,vendorid=0x1d6b,productid=0x0002: Bus '001' not found
Tried with connecting external usb keyboard but that didn't seem to work either.
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